Monsoon moisture and Hurricane Lorena will keep San Diego County hot and muggy Thursday

Twin sources of warm, moist air will keep San Diego County hot and muggy Thursday, thwarting forecasters who had thought temperatures were about to turn cooler.

The Gulf of California will continue to pump monsoonal air into the region, possibly through Friday. And the National Weather Service says a separate a similar plume could arrive from southwest of Baja California, where Hurricane Lorena was gaining strength on Wednesday evening.

The hurricane is producing winds upwards of 80 mph and could send lots of rain into coastal Baja, forecasters said. It’s unclear whether the system also will send big waves to San Diego.

These conditions will push Thursday’s daytime high to 82 in San Diego and into the upper 80s and the 90s across inland valleys and foothills, forecasters say.